Kunniitg-gear of locomotives



Patented lume '17, 1851.

G. s. GRIGGS.

Car Truck.

AV m N*UNITED sTATEs PATENT oEEi'oE.

` GEO. s. GRIGGs, on RoxBURY, ivIAssAoHUsETTs` RUNNING-GEAR 0F LOCOMOTIVES. i

Specication of Letters Patent No. 8,166,\dated June 17, 1851.

and accompanying drawings, letters, figures,

and references thereof.

Of the said drawings Figure l, denotes a top view of the frame drivingland bearlng lwheels of a locomotive engine. Fig. 2, is a side elevation of the same. y

In the said drawings A, represents the main frame, which sustains the boiler.

B, B are the driving wheels or drivers situated or fixed on the axle C. i

D D and `E E are the bearingor flange wheels, whose axles are seen at F and Gr.

I-I, H, are the pedestals or boxes of the journals of the bearing wheels, while I placed between them is the pedestal of one of the .journals o-f the axle of the drivers.

K L K, `arethe elastic springs of the pedestals H, Lil-I. a i p iM, N, M", are the housings orguides of the pedestals or boxes, all the above described parts being made, and applied together` in the usual manner. i

A bent lever 0, made to turn on a fulcrum or pin a, is applied to `the main frame or each housing of each pedestal I, the upper arm of the said lever being made to rest and bear upon the top ofthe box or pedestal.

To the lower arm of each lever, a connectt ing rod P or P is jointed, which rod is made to extend forward from the traction spring or bar Q, the cars or train on rear of the engine being attached directly to such bar or spring. The two connecting rods P, P, should, respectively, pass through, and be upheld by guide plates. R, R, extended downward from the rear end of the main frame, such rods being allowed to slidefreely through their bearingson the said guide plates. And there may be springs b, c, placed on each rod, and one thereof on each side of andv against the guide plate, as seen in Fig. 2,

`although this is not necessary in all cases.

When the engine is put in motion on the train of carriages in rear of it, will draw upon thero-ds P, P', and thereby turn the levers O, so as to depress the upperfarms thereof, lift the weight of the frame from the bearing wheels, and throw the principal part of the weight ofthe main frame, and

railway the back drag or resistance ofthe i parts supported on or by it, upon the l drivers, thereby increasing their power of adhesion to or pressure upon therails, and

of course enabling the engine to perform an increased pduty, in comparison to what it` could were it not provided with my` i1n` provement. i

Vhat I claim as my invention, is-

rIhe combination of the bent levers (O)` the connecting rods (P P) and tractile bar y or spring (or other equivalent contrivance or contrivances) with the main frame (or its housings) and the boxes or pedestals of the' journals of the driving wheels, and for the purpose, `substantially as herein before specified. i

In testimony whereof I `have hereto set my signature this twenty-ninth day of March A..D. 1851. y p

`GEORGE GRIGGS.

NVitnesses: i

R. H. EDDY, BENJAMIN EDDY. 

